18K white gold aquamarine tourmaline and diamond ring. This beautiful piece features 3 natural round pink tourmalines at the center of each of the three natural aquamarines measuring 6 mm to 7 mm in diameter. The ring also features 12 brilliant round white diamonds, totaling .10 of a carat. The top of the ring measures 3/8 of an inch wide. It is a size 4.5. Sizing is available. It weighs 4.3 grams.